interface user {
    name: string;
    age: number;
}

class User implements user {
    name: string;
    age: number;

    constructor(name: string, age: number) {
        this.name = name;
        this.age = age;
    }
}

let a: number = 12
enum Status {
    One, // 默认序号0 开始
    Two,
    Three
}

console.log(Status);